removed linked attribute
added tty port reference counting
store radio tty device instead of index; added radio tty register/unregister functions
refactor radio tty registration/unregistration and tty index calculation
unregister tty if EnableRtAcks=1 and TxData nack received
add module parameter to disable dynamic ttys
register radio tty when data received
added writeable remap attribute to initiate remapping of radio network
map radio network when joining
refactor dnt900_process_announcement
update documentation
replace EAGAIN with ECOMM; removed register retries on error
reload radio system address if radio_get_register fails
refresh radio if new sys address found for existing MAC
remove tty register/unregister stuff and implement carrier raise/drop functions instead
add ProtocolMode warning
version bump